<template>
  <view class="goods-detail-container">
    <!-- 轮播图区域 -->
    <swiper indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000">
      <swiper-item v-for="(item, index) in goods_info.pics" :key="index">
        <image :src="item.pics_big" @click="preview(index)"></image>
      </swiper-item>
    </swiper>
    <!-- 商品信息区域 -->
    <view class="goods-info-box" v-if="goods_info.goods_name">
      <view class="price">$ {{goods_info.goods_price}}</view>
      <view class="goods-info-body">
        <view class="goods-name">{{goods_info.goods_name}}</view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <view class="yf">快递: 免运费</view>
    </view>
    <!-- 商品详情区域 -->
    <!-- 使用 rich-text 组件,将带有 HTMl 标签的内容,渲染为小程序页面结构 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>
    <!-- 商品导航组 -->
    <!-- 
    fill 控制右侧按钮的样式
    options 左侧按钮的配置项
    buttonGroup 右侧按钮的配置项
    click 左侧按钮的点击事件处理函数
    buttonClick 右侧按钮的点击事件处理函数
     -->
    <view class="goods-nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick" @buttonClick="buttonClick"></uni-goods-nav>
    </view>
  </view>
</template>

<script>
  //  从 vuex 中按需导出 mapState 辅助方法 
  import { mapState, mapMutations, mapGetters } from 'vuex'
  export default {
    computed: {
      // ...mapState('模块名称', ['要映射的数据名称'])
      ...mapState('m_cart',['cart']),
      ...mapGetters('m_cart',['total'])
    },
    data() {
      return {
        // 商品详情对象
        goods_info: {},
        // 左侧按钮组的配置对象
        options: [
          {
            icon: 'shop',
            text: '店铺'
          },
          {
            icon: 'cart',
            text: '购物车',
            info: 0
          },
        ],
        // 右侧按钮组的配置对象
        buttonGroup: [
          {
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ]
      };
    },
    onLoad(options) {
      // 商品 id
      const goods_id = options.goods_id
      this.getGoodsDetail(goods_id)
    },
    methods: {
      ...mapMutations('m_cart', ['addToCart']),
      async getGoodsDetail(goods_id) {
        const {data: res} = await uni.$http.get('/api/public/v1/goods/detail', { goods_id })
        if (res.meta.status !== 200 ) return uni.$showMsg()
        
        // 为 img 添加行内的 style 样式,解决图片底部空白间隙的问题
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;"').replace(/webp /g, 'jpg')
         this.goods_info = res.message
      },
      // 实现轮播图图片预览效果
      preview(index) {
        uni.previewImage({
          // 预览时,默认显示图片的索引
          current: index,
          // 所有图片 url 地址的数据
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },
      onClick(e) {
        if (e.content.text ==='购物车' ) {
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      // 为商品导航组件添加点击事件
      buttonClick(e) {
        if (e.content.text === '加入购物车') {
          // 组织一个商品的信息对象
          const goods = {
            goods_id: this.goods_info.goods_id,
            goods_name: this.goods_info.goods_name,
            goods_price: this.goods_info.goods_price,
            goods_count: 1,
            goods_small_logo: this.goods_info.goods_small_logo,
            goods_state: true
          }
          
          this.addToCart(goods)
        }
      }
    },
    watch: {
      total: {
        handler(newVal) {
          // 通过数组的 find() 方法,找到购物车按钮的配置对象
          const findResult = this.options.find((x) => x.text === '购物车')
          if (findResult) {
            findResult.info = newVal
          }
        },
        // immediate 用来声明此侦听器是否在页面初次加载完毕后立即调用
        immediate: true
      }
    }
  }
</script>

<style lang="scss">
swiper {
  height: 750rpx;
  
  image {
    width: 100%;
    height: 100%;
  }
}
 .goods-info-box {
   padding: 10px;
   padding-right: 0;
   
   .price {
     color: #C00000;
     font-size: 18px;
     margin: 10px 0;
   }
   
   .goods-info-body {
     display: flex;
     justify-content: space-between;
     
     .goods-name {
       font-size: 13px;
       margin-right: 10px;
     }
     .favi {
       width: 120px;
       font-size: 12px;
       display: flex;
       flex-direction: column;
       align-items: center;
       justify-content: center;
       border-left: 1px solid #efefef;
       color: gray;
     }
   }
   .yf {
     font-size: 12px;
     color: gray;
     margin: 10px 0;
   }
 }
 .goods-nav {
   position: fixed;
   bottom: 0;
   left: 0;
   width: 100%;
  }
  .goods-detail-container {
    padding-bottom: 50px;
  }
</style>
